我正在将React.js与Bootstrap 4模态/轮播一起使用，我希望在模态打开时始终显示第一张图像。现在，第一次打开模态时显示第一个图像，但是当用户关闭并重新打开模态时，它显示的是用户查看的最后一个图像，而不是第一个。我试图在我的componentDidMount中使用jquery来强制轮播索引，但是它不起作用。
这里是我的预期行为的示例场景...1.打开模态（显示第一个图像）2.转盘到第二项3.关闭模态4.打开模态（显示第一个图像）
这里是Demo
index.js
import React, { Component } from 'react';
import { render } from 'react-dom';
import './style.scss';
import $ from 'jquery';
class App extends Component {
constructor() {
super();
}
componentDidMount() {
// My attempts to always have carousel begin at index 0 on show event
// $('.largeModal').on('show.bs.modal', function() {
// console.log('show.bs.modal event');
// $('.carousel').carousel(0);
// });
// $('.largeModal').on('show.bs.modal', function() {
// console.log('show.bs.modal event');
// $('#myCarousel').carousel(0);
// });
}
render() {
return (
<div className='container'>
<h3 className='text-center mb-4'>React with Bootstrap 4 Modal & Carousel</h3>
<div class='row mb-4'>
<div class='col text-center'>
<button
type='button'
className='btn btn-primary '
data-toggle='modal'
data-target='#largeModal'
>
Open Modal
</button>
</div>
</div>
{/* Modal*/}
<div
className='modal fade'
id='largeModal'
tabIndex='-1'
role='dialog'
aria-labelledby='basicModal'
aria-hidden='true'
>
<div className='modal-dialog modal-lg'>
<div className='modal-content'>
<div className='modal-body'>
{/* Carousel */}
<div
id='myCarousel'
className='carousel slide'
data-ride='carousel'
>
<ol className='carousel-indicators'>
<li
data-target='#myCarousel'
data-slide-to='0'
className='active'
></li>
<li
data-target='#myCarousel'
data-slide-to='1'
></li>
<li
data-target='#myCarousel'
data-slide-to='2'
></li>
</ol>
<div className='carousel-inner'>
<div className='carousel-item active'>
<img
className='img-size'
src='https://images.unsplash.com/photo-1485470733090-0aae1788d5af?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1391&q=80'
alt='First slide'
/>
</div>
<div className='carousel-item'>
<img
className='img-size'
src='https://images.unsplash.com/photo-1491555103944-7c647fd857e6?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1350&q=80'
alt='Second slide'
/>
</div>
<div className='carousel-item'>
<img
className='img-size'
src='https://images.unsplash.com/photo-1464822759023-fed622ff2c3b?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1350&q=80'
alt='Third slide'
/>
</div>
</div>
<a
className='carousel-control-prev'
href='#myCarousel'
role='button'
data-slide='prev'
>
<span
className='carousel-control-prev-icon'
aria-hidden='true'
>
{' '}
</span>
<span className='sr-only'>Previous</span>
</a>
<a
className='carousel-control-next'
href='#myCarousel'
role='button'
data-slide='next'
>
<span
className='carousel-control-next-icon'
aria-hidden='true'
></span>
<span className='sr-only'>Next</span>
</a>
</div>
</div>
<div className='modal-footer'>
<button
type='button'
className='btn btn-default'
data-dismiss='modal'
>
Close
</button>
</div>
</div>
</div>
</div>
</div>
);
}
}
render(<App />, document.getElementById('root'));
style.scss
.img-size{
height: 450px;
width: 700px;
background-size: cover;
overflow: hidden;
}
.modal-content {
width: 700px;
border:none;
}
.modal-body {
padding: 0;
}
.carousel-control-prev-icon {
background-image: url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='%23009be1' viewBox='0 0 8 8'%3E%3Cpath d='M5.25 0l-4 4 4 4 1.5-1.5-2.5-2.5 2.5-2.5-1.5-1.5z'/%3E%3C/svg%3E");
width: 30px;
height: 48px;
}
.carousel-control-next-icon {
background-image: url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='%23009be1' viewBox='0 0 8 8'%3E%3Cpath d='M2.75 0l-1.5 1.5 2.5 2.5-2.5 2.5 1.5 1.5 4-4-4-4z'/%3E%3C/svg%3E");
width: 30px;
height: 48px;
}
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>React Modal with Carousel</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
</head>
<body>
<noscript>You need to enable JavaScript to run this app.</noscript>
<div id="root"></div>
</body>
</html>
package.json
{
"name": "react",
"version": "0.0.0",
"private": true,
"dependencies": {
"bootstrap": "^4.4.1",
"jquery": "1.9.1 - 3",
"node-sass": "^4.13.1",
"popper.js": "^1.16.0",
"react": "^16.9.0",
"react-dom": "^16.9.0"
},
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test --env=jsdom",
"eject": "react-scripts eject"
},
"devDependencies": {
"react-scripts": "latest"
}
}
将图像属性存储在类似对象的数组中。并映射它们以进行渲染。
let arr = [
{
className:'img-size',
src:'https://images.unsplash.com/photo-1464822759023-fed622ff2c3b?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1350&q=80',
alt:'Third slide'
},
and more like this.
]
//Then map the images in carousel ann it would always show first image first, because it would always render images at runtime.
arr.map(img => {
return(
<img
className={img.className}
src={img.src}
alt={img.alt}
/>
);
})